Answer:
D
Step-by-step explanation:
State A has 25 drive-in movie screens and State B has 21. You find this by guess-and-checking different numbers that you could add together to get 46. You want to do numbers that are relatively close, as a difference in 4 is not much at all. You can divide 46 by 2 and then play around from there.
x^2 + 4x + 3 + 1 = (x + 2)^2
So 1 need to be added.